Due to covid, is it still possible for a person with lawn seating in one section move to sit in another lawn section once in?

Yes

For sure

There's really no rules for lawn seating. You can sit wherever you want. It's the assigned seating closer to the stage that you can't just switch seats at will

Yes of course.

Yes there's only one section of lawn that not offered to general lawn administration. The rest is free to roam.

The show we attended had plenty of "lawn" space to roam freely

Great! Thanks so much